Residents suggested the vehicles may have been moved onto the fields, which are popular with families, after a following a grass cutter onto the site when gates were not closed.

The caravans were spotted on Thursday afternoon (Image: Cyclecam)

Cardiff council said they were “investigating” reports but after starting the process to get the travellers moving last night , the caravans have left.

A council spokeswoman said: “The council has an “Unauthorised Encampment Protocol” in place which includes various agencies who assist when unauthorised encampments occur in Cardiff. This process has been initiated with regards to the reported encampment.

“Officers have attended the site and reported their findings back to the co-ordinator in order to initiate the correct proceedings to resolve this issue.”

But have now gone after Cardiff Council started the process to move them on (Image: CycleCam @CycleCammer)

Two ladies, who regularly go to Llandaff Fields for athletics club, said: “We don’t know why they are here. But we did see some in the car park around two weeks ago. There were also some near the sports centre a while back. We just don’t understand how they got there.”

Another local, who asked not to be named, said: “My husband said he saw different ones in the car park around two weeks ago.”